load pdf from sdcard or from the internal memory: Yes, it's possible, you need to pass the file path to the open method, check
http://www.androidpdf.mobi/documentation/javadocs/com/radaee/pdf/Document.html#Open(java.lang.String, java.lang.String)
www.androidpdf.mobi/documentation/javado...ocument.html#OpenMem
(byte[], java.lang.String)
http://www.androidpdf.mobi/documentation/javadocs/com/radaee/pdf/Document.html#OpenStream(com.radaee.pdf.Document.PDFStream, java.lang.String)